soc: renesas: Fix linker error from multiple IRQ17

Fix linker error caused by the smartbond timer driver
being enabled at the same time as the smartbond timer counter
driver. For some reason putting SMARTBOND_TIMER=n in a conf
file does not fix this, this change has to be made to the
Kconfig.defconfig to not add this default y case in order
to fix the error. At least that is all I could figure out,
and not sure why the .conf doesn't override it.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>